I recently had RFE on birth certificate. What I did was got 1 from the VDC, got typed in english, it just says so n so person , son/daughter of so n so was born on so n so date at so n so place as per the birth record maintained at the birth registration book maintained at this office. My birth wasnt registered there, its not difficult to get those papers in Nepal. I got my green card within 14 days after submitting the BC. Make sure it has ur mothers name in it too, coz they want that. you cannot use passport or naything as a substitute.